Nano porous pharmaceutical aluminum foil have been fabricated, characterized and optimized by using the anodization technique. The two-electrode cell was configured to observe the pore formation in pharmaceutical aluminum foil over a number of parameters such as concentration of alkaline medium for etching reaction, time for etching, concentration of acidic medium, the temperature and voltage for anodization reaction. The reactions were optimized to achieve adequate and uniform pore formation without any pinholes in the pharmaceutical aluminum foil. Etching reaction was best carried out at 1M sodium hydroxide solution for 3 minutes. The rate of etching was found to be dependent on the concentration of alkaline solution and was accountable for final appearance of the aluminum foil. Uniform pore formation was observed when this etched aluminum foil was subjected to 15% sulphuric acid medium and 9V DC current for 30 minutes. Scanning electron microscopy was used to confirm the presence of nano pores in the pharmaceutical aluminum foil. The SEM images also revealed that the entire reactions occurred only on the dull surface of the foil leaving the shiny surface of the aluminum foil untouched. The findings on characterization and optimization of nanopores in pharmaceutical aluminum foil were discussed.
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